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Level 12 - ALEWTH
The answer to this puzzle is:
Words: LATHE, WHEAL, TEAL, TELA, WHET, EATH, HAET, HALE, WELT, WEAL, WALE, LATH, THAW, THE, ALT, TEL, LEA, ATE, LAT, HEW, HAW, ETA, AWL, AWE, LAW
Bonus words:
LATHE, WHEAL, TEAL, TELA, WHET, EATH, HAET, HALE, WELT, WEAL, WALE, LATH, THAW, THE, ALT, TEL, LEA, ATE, LAT, HEW, HAW, ETA, AWL, AWE, LAW